Add device policy to disallow shutdown - WebUI modifications

chrome/browser/ui/webui/chromeos/login/core_oobe_handler.h

Index: chrome/browser/ui/webui/chromeos/login/core_oobe_handler.h
diff --git a/chrome/browser/ui/webui/chromeos/login/core_oobe_handler.h b/chrome/browser/ui/webui/chromeos/login/core_oobe_handler.h
index 405c0a91e18604e27e6471cd01c8b589a76c63d1..1fcccddaea9e29c44e214998ac680252c9dc500f 100644
--- a/chrome/browser/ui/webui/chromeos/login/core_oobe_handler.h
+++ b/chrome/browser/ui/webui/chromeos/login/core_oobe_handler.h
@@ -61,6 +61,11 @@ class CoreOobeHandler : public BaseScreenHandler,
     return show_oobe_ui_;
   }
 
+  // If |reboot_on_shutdown| is true, the reboot button becomes visible
+  // and the shutdown button is hidden. Vice versa if |reboot_on_shutdown| is
+  // false.
+  void UpdateShutdownAndRebootVisibility(bool reboot_on_shutdown);
+
  private:
   // CoreOobeActor implementation:
   void ShowSignInError(int login_attempts,